US4368588A - Explosive powder driven fastening fastening element setting device - Google Patents

Explosive powder driven fastening fastening element setting device Download PDF

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Publication number
US4368588A
US4368588A US06/233,069 US23306981A US4368588A US 4368588 A US4368588 A US 4368588A US 23306981 A US23306981 A US 23306981A US 4368588 A US4368588 A US 4368588A
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US
United States
Prior art keywords
frusto
casing
ring
conical surface
feed element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US06/233,069
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English (en)
Inventor
Peter Jochum
Franz Buechel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hilti AG
Original Assignee
Hilti AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hilti AG filed Critical Hilti AG
Assigned to HILTI AKTIENGESELLSCHAFT reassignment HILTI AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BUECHEL FRANZ, JOCHUM PETER
Application granted granted Critical
Publication of US4368588A publication Critical patent/US4368588A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
    • B25C1/00—Hand-held nailing tools; Nail feeding devices
    • B25C1/08—Hand-held nailing tools; Nail feeding devices operated by combustion pressure
    • B25C1/082—Hand-held nailing tools; Nail feeding devices operated by combustion pressure generated by detonation of a pellet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
    • B25C1/00—Hand-held nailing tools; Nail feeding devices
    • B25C1/08—Hand-held nailing tools; Nail feeding devices operated by combustion pressure
    • B25C1/10—Hand-held nailing tools; Nail feeding devices operated by combustion pressure generated by detonation of a cartridge
    • B25C1/14—Hand-held nailing tools; Nail feeding devices operated by combustion pressure generated by detonation of a cartridge acting on an intermediate plunger or anvil
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A3/00—Breech mechanisms, e.g. locks
    • F41A3/64—Mounting of breech-blocks; Accessories for breech-blocks or breech-block mountings
    • F41A3/74—Obturating or packing devices for gas leak prevention in breech mechanisms

Definitions

  • the present invention is directed to a setting device using the force generated by an explosive powder for driving fastening elements, such as bolts, nails and the like, into hard receiving materials.
  • the device includes a casing with a combustion chamber located within the casing.
  • One side of the combustion chamber is defined by a feed member for moving caseless propellent charges into the chamber and the opposite side of the chamber is formed by a counterpressure member with ignition means extending through the counterpressure member into the combustion chamber.
  • the feed member forms one side of the combustion chamber its outside surface is sealed by a ring having a radially outer frusto-conical surface.
  • a propellent charge When a propellent charge is fired, the propellent gases contact the ring and cause it to move into sealing contact with the feed member.
  • caseless propellent charges Due to the rising raw material costs of non-ferrous materials used for cartridge shells, the use of caseless propellent charges has again become interesting primarily for economic reasons. In addition to economic reasons, caseless propellent charges have additional advantages, for instance, a more compact packaging. There is a significant problem in the use of caseless propellent charges, however, that is, providing a seal for the combustion chamber. Extremely high pressure propellent gases are generated when a caseless propellent charge is fired and these gases escape through even the smallest gap in a seal causing a substantial drop in the propellent force of the charge. Conventional sealing rings are not capable of sealing the combustion chamber against such high pressure gases.
  • the feed element is sealed by a ring which has a sealing cone.
  • the propellent gases act on the ring and the ring is pressed against the sealing cone by the resulting force component. As the gas pressure increases, the ring is pressed more strongly against the sealing cone. Since the ring is subjected to substantial forces, a wear-resistant material is used for the ring. The use of such material, however, causes substantial wear in abutting parts. As a result, the casing containing the ring must be replaced when it becomes worn and such replacement is very expensive.
  • the sealing action is effected by providing a frusto-conical sealing surface on the casing with the surface tapering inwardly away from the combustion chamber and with a similar frusto-conical surface formed on the ring.
  • the ring is connected with the housing and for practical purposes is axially stationary. Due to this arrangement, possible wear does not occur in the casing, but rather on the feed member. If necessary, the feed member can be replaced much more easily than the housing. Since the ring encircles the outside surface of the feed member, this also results in a greater sealing surface being provided.
  • the frusto-conical surface cooperating with the ring is formed on an insert releasably connected to the casing.
  • the ring and the insert together form a unit.
  • they can be ground or cut together prior to assembly.
  • the insert can be replaced at the same time.
  • FIG. 1 is a side elevational view, partly in section, of a setting device embodying the present invention.
  • FIG. 2 is an enlarged detail of a portion of the setting device within the circle II in FIG. 1.
  • FIG. 1 a setting device is illustrated formed by an elongated casing 1 having a handle 2 extending downwardly from the casing. As viewed in FIG. 1 the left-hand end of the casing is its front end and the right-hand end is its rear end.
  • a barrel 3 is axially movably supported within the housing 1 having a front end or muzzle end at the front end of the casing and a rear end located within the casing.
  • a piston 4 is displaceably guided within the barrel 3 for driving fastening elements out of the muzzle end of the barrel.
  • a magazine passage 1a extends through the casing 1 perpendicularly of the axial direction of the barrel 3. Caseless propellent charges 6 are fitted into recesses in a magazine 5 located within the magazine passage 1a.
  • the rear end of the barrel 3 forms a feed member 3a which presses a caseless propellent charge 6 out of the magazine 5 and moves the charge into a combustion chamber 1b within the casing 1.
  • the movement of the barrel 3 and feed member 3a is effected by pressing the muzzle end of the barrel against the receiving material.
  • the propellent charge 6 has been placed in the combustion chamber 1b and the chamber is defined in the axial direction by the surface of the casing 1 and transversely of the axial direction of the barrel it is formed on one side by the end face of feed member 3a and on the opposite side by the end face of a counterpressure member 7.
  • the counterpressure member 7 has an axially extending bore therethrough aligned generally with the axis of the barrel and the bore serves to hold ignition means 8 for the charge within the combustion chamber.
  • the ignition means 8 can be provided by an ignition electrode.
  • the counterpressure member 7 is biased toward the front end of the casing 1 by a spring 9. When the muzzle end of the barrel is pressed against the receiving material, the counterpressure member is moved toward the rear end of the casing by the barrel 3 and the propellent charge 6 is displaced out of the magazine by the feed element 3a.
  • FIG. 1 illustrates the propellent charge 6 located within the combustion chamber.
  • the feed member When the barrel is displaced in the rearward direction, the feed member is encircled by a ring 10 with the rearward end face of the ring 10 being spaced a short distance in front of the combustion chamber 1b.
  • the ring 10 serves to seal the combustion chamber 1b around the outside surface of the feed member 3a. Any propellent gases which may still escape can be discharged to the exterior of the casing of the setting device through a discharge opening 1c.
  • ring 10 In FIG. 1, ring 10 is supported within an annular insert 11. The insert 11 is held in place within the housing 1 by a threaded sleeve 12. As can be seen in FIG.
  • the outer circumferential periphery of the sleeve is threaded and secured within a corresponding thread in the casing 1.
  • the feed element 3a on the rearward end of the barrel 3 is slidably displaceable through the sleeve 12.
  • FIG. 2 the portion of the ring 10 enclosed within the circle II in FIG. 1, is illustrated in FIG. 2 on an enlarged scale.
  • FIG. 2 a portion of the housing 1 and the feed element 3a can be seen.
  • a narrow gap 13 is present between the outside surface of the feed member 3a and the juxtaposed surface of the casing 1, when the feed element forms the front side of the combustion chamber 1b.
  • propellent gases can flow through the gap 13 and press the end of the ring in the direction away from the the combustion chamber so that the frusto-conical surface of the ring tends to move over the frusto-conical surface 14 of the insert 11 so that the radially inner surface of the ring 10 is pressed against the outside surface of the feed member 3a and correspondingly the insert is pressed against the casing 1.
  • the axially directed forces which are generated, are absorbed by the sleeve 12.
  • insert 11 is releasably positioned in the casing 1. It is also possible, however, to form the insert as an integral part of the casing.
  • the cone angle ⁇ of the frusto-conical sealing surface 14 is in the range of 20° to 30°, and preferably is 25°.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Portable Nailing Machines And Staplers (AREA)
US06/233,069 1980-02-13 1981-02-10 Explosive powder driven fastening fastening element setting device Expired - Fee Related US4368588A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19803005341 DE3005341A1 (de) 1980-02-13 1980-02-13 Pulverkraftbetriebenes bolzen-setzgeraet
DE3005341 1980-02-13

Publications (1)

Publication Number Publication Date
US4368588A true US4368588A (en) 1983-01-18

Family

ID=6094494

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/233,069 Expired - Fee Related US4368588A (en) 1980-02-13 1981-02-10 Explosive powder driven fastening fastening element setting device

Country Status (8)

Country Link
US (1) US4368588A (OSRAM)
JP (1) JPS56114682A (OSRAM)
CA (1) CA1149551A (OSRAM)
CH (1) CH650963A5 (OSRAM)
DE (1) DE3005341A1 (OSRAM)
FR (1) FR2475451A1 (OSRAM)
GB (1) GB2069110B (OSRAM)
SE (1) SE452718B (OSRAM)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5208420A (en) * 1992-03-13 1993-05-04 Hamilton Brian K Propellant strip assembly
US5251532A (en) * 1991-11-11 1993-10-12 Hilti Aktiengesellschaft Cartridge clip for setting tool
US5749509A (en) * 1995-06-05 1998-05-12 Sencorp Resiliently expandable ring seal for combustion chamber of propellant tool
US6065237A (en) * 1997-09-29 2000-05-23 Hillesland; Gene G. Pistol
US6286743B1 (en) * 1999-02-11 2001-09-11 Hilti Aktiengesellschaft Explosive powder charge-operated setting tool
US20060060628A1 (en) * 2004-08-30 2006-03-23 Larkin John F Combustion fastener

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3572729A (en) * 1968-05-23 1971-03-30 Olin Corp Expanding ring seal
US3973708A (en) * 1974-04-25 1976-08-10 Hilti Aktiengesellschaft Setting tool containing a laval nozzle
US4063672A (en) * 1975-04-01 1977-12-20 Hilti Aktiengesellschaft Charge feeding arrangement for an explosive charge driven setting gun
US4138788A (en) * 1977-03-14 1979-02-13 Hilti Aktiengesellschaft Explosive powder operated setting device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH284467A (de) * 1950-08-23 1952-07-31 Oerlikon Buehrle Ag Patronenlagerdichtung an automatischen Feuerwaffen mit Revolvertrommel.
DE1578234A1 (de) * 1965-05-05 1971-01-07 Smith And Wesson Inc Elektrisches Gewehr und dafuer geeignete Munition
CH578404A5 (OSRAM) * 1973-08-09 1976-08-13 Olin Ski Ag
DE2362073C2 (de) * 1973-12-13 1983-08-25 Hilti AG, 9494 Schaan Pulverkraftbetriebenes Bolzensetzgerät mit Trommelmagazin
DE2436446C2 (de) * 1974-07-29 1984-11-29 Hilti Ag, Schaan Pulverkraftbetriebenes Setzgerät

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3572729A (en) * 1968-05-23 1971-03-30 Olin Corp Expanding ring seal
US3973708A (en) * 1974-04-25 1976-08-10 Hilti Aktiengesellschaft Setting tool containing a laval nozzle
US4063672A (en) * 1975-04-01 1977-12-20 Hilti Aktiengesellschaft Charge feeding arrangement for an explosive charge driven setting gun
US4138788A (en) * 1977-03-14 1979-02-13 Hilti Aktiengesellschaft Explosive powder operated setting device

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5251532A (en) * 1991-11-11 1993-10-12 Hilti Aktiengesellschaft Cartridge clip for setting tool
AU648445B2 (en) * 1991-11-11 1994-04-21 Hilti Aktiengesellschaft Cartridge clip for setting tool
US5208420A (en) * 1992-03-13 1993-05-04 Hamilton Brian K Propellant strip assembly
US5749509A (en) * 1995-06-05 1998-05-12 Sencorp Resiliently expandable ring seal for combustion chamber of propellant tool
US6065237A (en) * 1997-09-29 2000-05-23 Hillesland; Gene G. Pistol
US6286743B1 (en) * 1999-02-11 2001-09-11 Hilti Aktiengesellschaft Explosive powder charge-operated setting tool
AU753510B2 (en) * 1999-02-11 2002-10-17 Hilti Aktiengesellschaft Explosive powder charge-operated setting tool
US20060060628A1 (en) * 2004-08-30 2006-03-23 Larkin John F Combustion fastener
US8002160B2 (en) 2004-08-30 2011-08-23 Black & Decker Inc. Combustion fastener

Also Published As

Publication number Publication date
CH650963A5 (de) 1985-08-30
GB2069110A (en) 1981-08-19
JPS56114682A (en) 1981-09-09
GB2069110B (en) 1983-01-19
SE452718B (sv) 1987-12-14
SE8100399L (sv) 1981-08-14
FR2475451A1 (fr) 1981-08-14
FR2475451B1 (OSRAM) 1984-09-14
DE3005341A1 (de) 1981-08-20
CA1149551A (en) 1983-07-12

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Date Code Title Description
AS Assignment

Owner name: HILTI AKTIENGESELLSCHAFT, 9494 SCHAAN, FURSTENTUM

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:JOCHUM PETER;BUECHEL FRANZ;REEL/FRAME:003867/0633

Effective date: 19810120

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Free format text: MAINTENANCE FEE REMINDER MAILED (ORIGINAL EVENT CODE: REM.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

LAPS Lapse for failure to pay maintenance fees
STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362

FP Lapsed due to failure to pay maintenance fee

Effective date: 19870118